[英]Downloading files into root app directory using Swift
我是Swift編碼的新手,我對Objective C沒有太多的經驗,所以我嘗試從Web(csv)下載文件並將其轉儲到根程序目錄中。
不幸的是,盡管我正在通過ObjectiveC中的http://www.appcoda.com/background-transfer-service-ios7/進行該教程的學習,但是我在Swift中找不到任何使用方法的教程。
這可能是很基本的(道歉),但是我試圖在Swift中創建一個類,以替換ObjectiveC中FileDownloadInfo類的實現。 (如果有人有本教程的Swift示例,那將非常有幫助。
在ObjectiveC中的實現是:
@implementation FileDownloadInfo
-(id)initWithFileTitle:(NSString *)title andDownloadSource:(NSString *)source{
if (self == [super init]) {
self.fileTitle = title;
self.downloadSource = source;
self.downloadProgress = 0.0;
self.isDownloading = NO;
self.downloadComplete = NO;
self.taskIdentifier = -1;
}
return self;
}
@end
然后通過以下方式填充FileDownloadArray
-(void)initializeFileDownloadDataArray{
self.arrFileDownloadData = [[NSMutableArray alloc] init];
[self.arrFileDownloadData addObject:[[FileDownloadInfo alloc] initWithFileTitle:@"iOS Programming Guide" andDownloadSource:@"https://developer.apple.com/library/ios/documentation/iphone/conceptual/iphoneosprogrammingguide/iphoneappprogrammingguide.pdf"]];
}
我已經在Swift類中創建了以下內容,但是當然沒有任何功能-如何修改它以使我能夠以與上述相同的方式填充數組?
import UIKit
class FileDownloadInfo: NSObject {
var fileTitle: NSString
var downloadSource: NSString
var downloadTask: NSURLSessionDownloadTask?
var taskResumeData: NSData?
var downloadProgress: Double
var isDownloading: Bool
var downloadComplete: Bool
var taskIdentifier: Int
init(initWithFileTitle title: NSString, andDownloadSource source: NSString) {
self.fileTitle = title
self.downloadSource = source
self.downloadProgress = 0.0
self.isDownloading = false
self.downloadComplete = false
self.taskIdentifier = -1
}
}
我只閱讀了部分介紹,這是我的看法。 希望它能有所幫助。 為了直接翻譯,您可以嘗試:
func initializeFileDownloadDataArray(){
arrFileDownloadData = [FileDownloadInfo]()
arrFileDownloadData.append(FileDownloadInfo("iOS Programming Guide", downloadSource:"https://developer.apple.com/library/ios/documentation/iphone/conceptual/iphoneosprogrammingguide/iphoneappprogrammingguide.pdf" ))
}
如果我正確閱讀,則初始化程序的格式類似於以下格式:
init(title: String, downloadSource: String) {
self.fileTitle = title
self.downloadSource = source
self.downloadProgress = 0.0
self.isDownloading = false
self.downloadComplete = false
self.taskIdentifier = -1
}
希望能奏效。
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